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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7971c527cedd00be4de19ed3580d617cbcb2322637e8844457b0fcae16a0451' 
  AND token = 'DwjU63AbP9rTUlUhyBRPeluWagKNNt10f/WWU4ZZj6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}